• Ifanycrankpinhasworn beyondtheservicelimit,thecrankshaftmustbereplaced.Duetotheadvancedtechniquesusedduringmanufacture,thecrankshaftcannotberegroundand oversizebearingsarenotavailable.

Conrodbigendbearing/crankpinclearance
Standard	0.065-0.035mm
ServiceLimit	0.100mm

12. ServiceManual·RocketIll

ConnectingRodBearingSelection

Note:

• Optimumrunningclearanceisachievedbyusingselectivebigendbearings.Forfurtherinformationonbearingpartnumbertocolourcross-references,refertothepartsinformationsystem.

Selectthecorrectbigendbearingshell asfollows:

1. Measureeachcrankpindiameter.

2. Selectthecorrectbearingsbymatchingtheinformationfoundwiththechartbelow.

Bigendbearingselectionchart

CrankshaftMainBearing/JournalWear

Usingselectivebearingscompensatesforminordifferencesincrankshaftmainbearingjournalandcrankcasedimensions.Forfurtherinformationonbearingpartnumbertocolourcross-references,refertothepartsinformationsystem.

1. MeasurethebearingtocrankshaftmainjournalclearanceusingPlastigage(Triumphpartnumber3880150-T0301).Usethesamemethodasdescribedinconnectingrodclearancemeasurement.

CheckingcrankshaftclearanceusingPlastigage

ShellColour	White	Red
Crankpindiameter	40.960to 40.954	40.953to 40.946

Forinstance:CrankpindiameterRequiredBearingNote:

40.958

White

2. Crankshaft mainbearing/journalclearance
   Standard	0.018-0.041mm
   Servicelimit	0.100mm

   Iftheclearanceexceedstheservicelimit,

measurethediameterofthecrankshaftmainbearingjournal.

• Repeat the measurements for all

connectingrodsandtheirrespectivecrankpins.Itisnormalforthebearingsselectedtodifferfromoneconnectingrodtoanother.

Crankshaftmainbearingjournaldiameter
Standard	43.092-43.108mm
Servicelimit	43.068mm

Note:

• Ifanyjournalhaswornbeyondtheservicelimit,thecrankshaftmustbereplaced.Duetothetechniquesusedduringmanufacture,thecrankshaftcannotberegroundandoversizebearingsarenotavailable.

Selectbearingsasfollows:

1. Measureandrecordthediameterofeachcrankshaftmainbearingjournal.

2. Measureandrecordeachmainbearingborediameterinthecrankcase{bearingsremovedbutallcrankcaseboltsfullytorqued(seepage5.8).

Note:

• Theoriginalcrankcaseboltsmaybereusedforbearingselection.Donotusenew boltsastheymayonlybeusedonce,evenifthesingleuseisrelatedtobearingselection.

ServiceManual-RocketIll

5.13

Comparethedatafoundwiththechartabovetoselectbearingsindividuallybyjournal.

ShellColour	White	Red	Red	Blue	Blue	Green
Crankcaseborediameter	46.105to46.097	46.105to46.097	46.114to46.106	46.114to46.106	46.123to46.115	46.123to46.115
Crankshaftjournaldiameter	43.108to43.100	43.099to43.092	43.108to43.100	43.099to43.092	43.108to43.100	43.099to43.092

Forexample:CrankcaseBore

CrankshaftJournaldiameterBearingRequired

Note:

46.099mm

95. mm

BLUE

CrankshaftEndFloat